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Lindsay Lohan was ARRESTED at 4 AM Thursday in New York City for allegedly getting into a fight at a New York City nightclub law enforcement sources tell TMZ. Our sources say Lohan was at Club Avenue when she got into some sort of argument with a female patron and it became physical. We're told cops came and arrested Lindsay for allegedly assaulting her. At the time of this post Lindsay is still at the police station.

And this isn't Lindsay's only legal problem. TMZ broke the story ... she is about to be charged with lying to cops in June after her car accident on Pacific Coast Highway. She told them she was a passenger in the Porsche when actually she was driving.And, if Lindsay is formally charged with the latest crime, it could trigger yet another probation violation.

Video of her arrest below.

UPDATE 7AM ET: We're told Lindsay is still at the police station getting booked for third degree misdemeanor assault, and she's "visibly tired."

7:40AM ET: Lindsay's about to be released with a desk appearance ticket ... meaning she'll have to appear before a judge sometime in the near future. 8:00AM ET: Lindsay Lohan has been released and was seen leaving the police station with a jacket covering her face.

Video of her Leaving the Police Station

Updated TMZ Article:Lindsay Lohan was ARRESTED at 4 AM Thursday in New York City for allegedly punching a woman at a New York City nightclub ... law enforcement sources tell TMZ.

Our sources say Lohan was at Club Avenue when she got into some sort of argument with a female patron and it became physical. We're told cops came and arrested Lindsay for allegedly assaulting her.

Law enforcement tells us prior to the fight words were exchanged between Lindsay and the woman as they sat in separate booths near each other. Lindsay said something to the effect of, "Give me my space." Some time passed and then, for some reason, Lindsay allegedly punched the girl in the left side of her face.

We're told by the time cops arrived Lindsay had left the club and was a passenger in a car that was leaving the area. Cops intercepted the car and made the arrest.While Lohan was in cuffs, she kept repeating, "Are you kidding me? Are you kidding me?"

Lindsay was booked for 3rd degree misdemeanor assault, given a desk appearance ticket (meaning she must show up in court in the near future) and released several hours after she was taken into custody. Law enforcement says she was 'visibly tired" at the station.

We're told investigators went back to the club looking for security footage of the alleged altercation.

Lindsay Lohan may not have been acting like herself in the hours before her arrest ... 'cause she was fighting off a bad case of BIEBER FEVER.

Lohan attended the Justin Bieber concert at Madison Square Garden in NYC last night -- we're told she had pretty great seats, too.

It's unclear if Lohan digs Bieber's music -- or just thought the concert would be a good place to pick up chicks.

Of course, things turned pretty sour for Lohan right after the show ... when she rolled over to a Manhattan nightclub and allegedly punched a woman in the face.

Belieb dat.

srclol in case anyone cares.The patriarch of the troubled Lohan clan took to Twitter shortly after news broke of Lindsay’s arrest, writing:

“This is for ALL parents who go or went thru the same! Please don't make the mistakes!

"Do you see what I mean when our children don't have BOTH parents there for them and on the same page! I have tried and tried but takes two!"

"I have been trying for years and especially over the past two weeks but my pleas have gone unheard Children need BOTH PARENTS, not alienation”